MESON Chess Problem Database

Problem Display
PID: 227776 (8/1P1k2p1/5pN1/2Q2K2/8/8/8/8 w - - 0 1)

Schonberger, Tibor

Magyar Sakkvilag, 1926

8/1P1k2p1/5pN1/2Q2K2/8/8/8/8

#2

4 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd8
      • 2.Qe7#
      • 2.Qc8#
    • 1...Ke8
      • 2.Qe7#
  • Tries
    • 1.Ke4?
      • 1...Ke6
        • 2.Qe7#
        • 2.Qd5#
      • 1...Kd8
        • 2.Qe7#
        • 2.Qc8#
      • 1...Ke8
        • 2.Qe7#
      • 1...f5+!
    • 1.Se5+?
      • 1...Kd8
        • 2.b8Q#
        • 2.b8R#
      • 1...Ke8
        • 2.b8Q#
        • 2.b8R#
      • 1...fxe5!
    • 1.Sf8+?
      • 1...Kd8
        • 2.b8Q#
        • 2.b8R#
      • 1...Ke8!
    • 1.Qd6+?
      • 1...Ke8
        • 2.Qe7#
      • 1...Kxd6!
    • 1.Qd5+?
      • 1...Ke8
        • 2.b8Q#
        • 2.b8R#
      • 1...Kc7!
    • 1.Qc6+?
      • 1...Kd8
        • 2.Qc8#
        • 2.b8Q#
        • 2.b8R#
      • 1...Kxc6!
    • 1.Qc7+?
      • 1...Ke8
        • 2.Qe7#
        • 2.b8Q#
        • 2.b8R#
      • 1...Kxc7!
    • 1.b8S+?
      • 1...Ke8
        • 2.Qe7#
        • 2.Qf8#
      • 1...Kd8!
    • 1.b8B?
      • 1...Ke8
        • 2.Qe7#
      • 1...Kd8!
  • Keys
    • 1.Qb5+!
      • 1...Kd6
        • 2.b8Q#
        • 2.b8B#
      • 1...Kc7
        • 2.b8Q#
      • 1...Kd8
        • 2.b8Q#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(b);S_FLIGHT::QAR1(A)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • K(b);S_FLIGHT::QAR1(A)
      • Refutation
        • P(a);CHECK
    • Try
      • S(C);CHECK
      • Vars
        • K(b);P-FLIGHT::P=Q
        • K(b);S_FLIGHT::P=Q
      • Refutation
        • P(a);XS(C)
    • Try
      • S(C);CHECK
      • Vars
        • K(b);P-FLIGHT::P=Q
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR1(A)
      • Refutation
        • K(b);P-FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::P=Q
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • K(b);S_FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(b);P-FLIGHT,XQ(A)
    • Try
      • P(D);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • P(D);
      • Vars
        • K(b);S_FLIGHT::QAR1(A)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(A);CHECK
    • Vars
      • K(b);P-FLIGHT::P=Q
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